Meltem Kahya Düdükcü Meltem Kahya Düdükcü FEN FAKÜLTESİ KİMYA BÖLÜMÜ
Araştırmacının yayınlarını daha detaylı bir şekilde aramak veya filtrelemek için buraya tıklayabilirsiniz.

H2O2 Sensing on Co3O4-s-rGO Modified with Ni Nanodots

Rukan Suna Karatekin | Meltem Kahya Düdükcü | Gülşen Avcı

In this paper, Ni@Co3O4-s-rGO was synthesized and constructed as a non-enzymatic sensor to detect hydrogen peroxide(H2O2). The prepared sample was characterized using SEM–EDX, UV–vis, XRD, and Raman spectroscopy. In 0.1 Mphosphate-buffered saline (PBS), the fabricated Ni@Co3O4-s-rGO amperometric sensor demonstrated a high sensitivity of 160.3 μA·mM⁻1 towards H2O2 within the linear detection range of 1 to 2000 μM. The detection limit was also determinedas 3.6 μM. Furthermore, the Ni@Co3O4-s-rGO catalyst demonstrated high selectivity towards H2O2,even in the presenceof common interferents. The enhanced electrochemical sensing ability of the catalyst is attributed to the synergy of three factors: the relatively large electrode active area, the high electrical conductivity, and the electron mobility in the presenceof ultra-nanosized Ni particles.

A highly efficient catalyst consisting of Ni and S double-doped reduced graphene modified with ZnO nanoparticles for hydrogen peroxide electroreduction

Sedef Kaplan A, Rukan Suna Karatekin A

n this study, we prepared a novel electrocatalyst based on S doped reduced graphene layer modified with Ni and ZnO nanoparticles. The catalyst materials were characterized by X-ray Powder Diffraction (XRD), Raman spectroscopy, UV–vis spectroscopy, Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX), and mapping. Because of the synergistic effect between three materials (S, Ni, and ZnO), the new electrocatalyst finally formed with a large electroactive surface area. Through the measurement, it was concluded that this surface includes large active sites which can effectively improve the electron transfer rate. The electrocatalytic activity of Ni-ZnO@s-rGO toward H2O2 reduction was examined via some measurements such as CV, I-t measurement, and electrochemical impedance spectroscopy. From CV measurement, the Ni-ZnO@s-rGO showed excellent electrocatalytic activity towards H2O2 accompanied by high current density with a reduction peak in the cathodic region. Our sensor exhibits a low detection limit of 0.16 µM, and with a good sensitivity value of 160.3 µAmM−1 under a wide linear range of analyte concentration from 1 µM-2000 µM. Besides, the proposed sensor electrode shows high selectivity toward H2O2.